Air feed control for rock drills



June 29 1926. 1,590,243

. G. W. HULSHIZER AIR FEED CONTROL FOR ROCK mums Filed Feb/l8, 1924 y 4 WM INVENTOR fieo yeI llliuidhj ev ms ATTR EY Patented June 29,1926.

GEORGE WLHULSHIZEB, OF STEWAR'I'SVILLE, NEW? i'l'Z EBSEY,- RSS IGNOR INGRE- sort-mun couramz,

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Applioatiorfl-ed February 1a,1a24. Serial no. 093,479.

This invention relates to fluid pressureop- ,hammer piston, which forms a percussive erated rock drills of the hammer type, but more particularly to an air feed control for the feeding element which advances the ;l machine. The invention is especially applicable to'a stope drill, although it may be advantageously used in connection with drifters and oth'er'types of'rock drills for drilling horizontal and down holes.

Iii operating a stope drill for instance,

which may be taken as an illustrative ex: ample, if a soft spot is encountered, the power of the airfeed should 'ordinarilybe reduced, but full rotation and hammer power retained to enable the machinetofeperate in 'the most eflicient manner. v The object of the present invention is to I enable the air feeding -element of'a rock drill 'to' be readily controlled in an imf proved and simplified manner by .the cp erator without reinoving his hand from the rotation handle.

Another object of the invention is to enable the feeding element of a rock drill to be controlled by a valve which is adapted to controlthe. supply, of pressure fluid to the feeding element and is also adapted to bleed pressurefluid ,from the feeding element at the. will of theoperator.

39 Afurther object of the invention is-to enable.a valve which is adapted to control the feeding element of a rock drill to be locked in different positions v Further objects of the invention-will hereinafter appear and the invention'is. shown in one'of its-preferred forms in the accompanying drawings in which,

Figure 1 is a side elevation partly in 'vertical section of a stops drill embodyingthe present invention;

Fi 2 is an enlarged vertical section of (;:h rotation handle shown in Figure 1;

Figure 3 is a" transverse section taken on,

the line -33.of Figure 2,,looking in the direction of the arrows showing the teeth on the top ofthe atctuating sleeve. Referring to h drawings, "A the cylinder of a fluid actuated'stope drill to which is connected a front head .B which is adapted to receive the drill steel 0. The cylinder A and front head B are preferably 7 connected together by the usual spring. pressed side-bolts D. The drill steel 0 is adapted to receive the impact blows of the feed cylinder F. I

designateselement of the machine, located in the cyl-- inder A, and thedrill steel may be rotated I by any suitablemeans, but in this instance is rotated by an independent rotation motor located in the casingE.

The feeding element of, the machine in this instance comprises a cylinder F in which is located a piston G to which is connected a piston rod H carrying the usual rock engaging pointer J. The head block K is in this-instance located between the feed cylinder F and the motor casing E, and res sure fluid is supplied-to'the machine through a suitable connection L. A suitable valve having an actuating handle 0 is adapted- .tocontrol the] admission of pressure fluid I .to the percussive element and the feeding element in any' suitable manner. A rotation handle P, preferably having an extension Q,

is in this instanceconnected to the head block K by a nut R screwed onto the threaded end'portion S' of the handle P. I i-accordance with the present invention, the rotation handle P is formed with a hollowbo're'f'l and'pressure fluid is ada 'tedsto pass to the feed cylinder F from the t rottle valve, through a port U in the head block K, .and throu'h a port Vin the rotation handle P and mto'the reduced bore W in the I rotation handle, and then through a port X- in the rotation handle which is ref'erably in staggeredrelation to the .port and from the-port X'through the passage Y into the In orderito control the assage' of pressure fluid to the feed 'cylin er F, a valve Z is slidably mountedin. the rotation handle P, and is preferably formed with ahead a i which is ada ted tov slide in the bore W, a

central head which is adapted to slide in the Iargerbore T, and an' outer head 0 also adapted to slide. in the boreT. The headsa and b are connected together by the stem d, and the heads 6 and-c are connected top gether by the stem 6. The stem (1 is prefer ably formed with a, hollow bore 7 which communicates at, one end with an an Iflar groove 9 in the head a by meansof port h, and the opposite end of the bore/f communicates with the hollow .bore T of the rotation handle P by means of a port j in the head 6. The head 0 is in this instance formed with'a port k, and one end of the 'bore T is closed-by a screw threadedplug the rotation handle of the opposite end and forces the end if of the valve 0 against the, cam s. knurled sleeve '0 preferably having one end 'w closed is mounted .on the rotation han dle extension Q and the. stem (1 is in this .instance connected to rotate with the sleeve oby a suitable pin a. The stem g is preferably formed with a reduced end portion 3 and a screw threaded bushing a prevents the stem q from sliding from the extension Q when the sleevev is removed from the extension Q.

A collar 2 is in this instance mounted on the rotation handle extension Q to slide on the perimetric surface thereof and 1s preferably formed with a keyway 3 into which extends a key 4 carried by \the extension Q so that the collar 2 may slide longitudinally on the extension Q but is prevented from turning. The sleeve 2: is in this instance formed with ratchet teeth 5 and the collar 2 is also formed with ratchet teeth 6 which bear against the ratchet teeth 5. A coil spring 7 bears against the rotation handle P at one end and against" the collar 2 at the opposite endfand serves to hold the ratchet teeth .5 and 6 together.

In the operationof the device by turning or rotating the knurled sleeve :0, the stem 9- willbe turnedor rotated so that the cam s will bear against the end at of the valve' head 0 and move the valve Z longitudinally in the rotation handle P. Whenever a soft spot is encountered by the drill steel, the power of the air feed should ordinarily be'reduced, but full rotationand hammer power retained, and in such a case thesleeve Q: will be rotated to move the. valve Z until the head a reduces the flow of airinto the air feed cylinder F "by reducing or, if

desired, entirely closing the port X in the rotation handle P. In this manner the power. of the air feed may be-readily reduced by reducing the flow of pressure fluid to the air feed cylinder, and, if it is desired. .to shut off the. feed entirely, this also may be accomplished by moving the valve Z to entirely close the. port, X.

Whenever it is desired to further reduce the power of the air feed some of the pressure fluid from the air feed cylinder F may be bled to atmosphere by further rotating the knurled sleeve '0 so that the annular In order to rotate the stem g, -a'.:-

.ment to be controlled, a valve handle.

Whenever the sleeve '0 is turned or ro- 5 and 6 'on. the sleeve '0 and the collar 2 respectively will serve to lock the valve Z in whatever position the operator desires it to' remain, and when it is desired that the feeding element operate normally, the sleeve '0 may be rotated in the opposite direction and the coil spring a .will return the valve.

Z to its normal position. It will be observed that the sleeve '4) may be rotated in either direction, either a partial or a complete revolution about the extension Q, to actuate the valve Z because the cam s will operate against the end t of the valve head 0 in either direction the stem g is rotated.

I claim:

tat'ed to a desired position the ratchet teeth 1. 'In a rock drill the combination with i verse passage adapted to register with one" of the ports for releasing pressure fluid from the element to be controlled, a passage long1- tudinally through the valve communicating with the transverse passage and with the at mosphere, a stem mounted rotatably in the handle, a cam on the. stem for actuating the valve in one direction to place the element to be controlled in communication with the atmosphere, a spring for movin the valve in the other dlrection and for iOlding said valve in constant contact with the cam, a .rotatable sleeve on said handle and secured to the stem for mani ulating the cam, said sleeve being adapte to describe acomplete revolution about the handle, a spring pressed collar slidable on the perimetricsurface on the handle to cooperate with the sleeve for holding the cam in an adjusted position, and means for holding the collar against'rotation with respect to the handle.

2. In a rock drill the'combinatiomwith an element to be controlled and a source of pressure fluid supply,of a.handle, ports through the handle for admitting pressure fluid from the, source of suppl to the eleongitudinalmovable in the handle for controlling the ow of pressure fluid through the ports, a transverse passage adapted to re 'ister with one of the ports, a passage longitudinally through the valve communicating with the a transverse passage for conveying pressure fluid from the element to be controlled to the atmosphere, a stem rotatable in the handle, a cam on one, end of the stem for actuating the valve in one direction, a spring encircling the valve for moving the valve in the opposite direction and for pressing one end of the valve constantly against the cam, a sleeve rotatable on the handle con-- nected to rotate the stem, ratchet teeth on one end'of the sleeve, a collar slidable on the handle and having ratchet teeth to c0- operate with the ratchet teeth on the sleeve for holding the cam in tion, means for holding the .collaragainst rotation with respect to the handle, and a an adjusted posi- D spring around the handle for holding the dle in engagement with each other.

In testlmony whereof I have signed this specification.

GEORGE w. HULSHIZER.

ratchet teeth on the sleeve and on the han-- 

